AD NUMBER: 2012-10-05

SUMMARY: This AD was prompted by an in-flight failure of the hydraulic control panel, which resulted in the absence of pressure and quantity indication of the
hydraulic system and accompanying alerts for "hydraulic system 1 low quantity" and "hydraulic system 2 low quantity."

This AD requires implementing new abnormal procedures for hydraulics in the airplane flight manual (AFM). The FAA is issuing this AD to prevent loss of control of the airplane due to incorrect hydraulic system failure information being provided to the flightcrew, followed by application of inappropriate procedures.